<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 警示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤区 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品照片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs @tab-click="tabClicked" :before-leave="beforeTabLeave" v-model="activeIndex" :tab-position="'left'" >
          <el-tab-pane label="基本信息" name='0'>
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
               <el-cascader
                :on-success="handleSuccess"
                v-model="addForm.goods_cat"
                :options="catelist"
                expand-trigger="hover"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name='1'>
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableDate" :key="item.attr_id">
              <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox border v-for="(cb,i) in item.attr_vals" :key="i" :label="cb"></el-checkbox>
                </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name='2'>
             <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-input v-model="item.attr_vals"></el-input>
                </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name='3'>
            <!-- action表示图片要上传到的后台api地址 -->
            <el-upload
              :headers="headerObj"
              class="upload-demo"
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name='4'>
             <quill-editor v-model="addForm.goods_introduce"></quill-editor>
             <!-- 添加商品按钮 -->
             <el-button @click="add" type="primary" class="btnAdd">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previesVisible"
      width="60%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex:'0',
      //添加商品的表单数据对象
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        //商品所属的分类数组
        goods_cat:[],
        //  图片数组
        pics:[],
        //商品详情描述
        goods_introduce:''
      },
      //添加商品的表单验证规则
      addFormRules:{
        goods_name:[
          { required: true, message: '请输入商品名称',trigger:'blur'}
        ],
        goods_price:[
          { required: true, message: '请输入商品价格',trigger:'blur'}
        ],
        goods_weight:[
          { required: true, message: '请输入商品重量',trigger:'blur'}
        ],
        goods_number:[
          { required: true, message: '请输入商品数量',trigger:'blur'}
        ],
        goods_cat:[
          { required: true, message: '请输入商品分类',trigger:'blur'}
        ]
      },
      //商品分类列表
      catelist:[],
      //商品分类列表
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      //动态参数列表数据
      manyTableDate:[],
      //静态属性列表数据
      onlyTableData:[],
      //图片上传地址URL
      // uploadURL:'',
      //图片上传组件的headers请求头对象
      headerObj:{
        Authorization: window.sessionStorage.getItem('token')
      },
      //预览图片路径
      previewPath:'',
      //图片显示隐藏
      previesVisible:false,
      //商品详情介绍
      goods_introduce:''
    }
  },
  methods: {
    async getCateList(){
      const { data:res } = await this.$http.get('categories')
      if(res.meta.status !==200 ){
        return this.$message.error('获取商品分类数据失败！')
      }
      this.catelist = res.data
    },
    //级联选择器选中项变化，会触发这个函数
    handleChange(){
      if(this.addForm.goods_cat.length !==3){
        this.addForm.goods_cat = []
      }
    },
    //激活页面判断条件
    beforeTabLeave(activeName,oldActiveName){
      //  console.log(oldActiveName+activeName)
       if(oldActiveName ==='0'&&this.addForm.goods_cat.length !==3){
         this.$message.error('请选择商品分类')
         return false
       }
    },
    //激活面板的监听事件
    async tabClicked(){
      //证明访问的是动态参数列表
      if(this.activeIndex ==='1'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'many'}
        })
        if(res.meta.status !==200){
          return this.$message.error('获取动态参数列表失败')
        }
        res.data.forEach(item =>{

          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.$message.success('获取动态参数列表成功')
        this.manyTableDate = res.data
        
        console.log(res.data)
      }else if(this.activeIndex === '2'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'only'}
        })
        if(res.meta.status !==200){
          return this.$message.error('获取静态属性失败')
        }
        this.onlyTableData = res.data
      }
    },
    //处理图片预览效果
    handlePreview(file){
      this.previewPath = file.response.data.url
      this.previesVisible = true
    },
    //处理图片移除的操作
    handleRemove(file){
      console.log(file)
      //1获取将要删除的图片临时路径
      const filePath = file.response.data.tmp_path
      //2从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic ===filePath)
      //3，调用数组的splice方法，把图片信息对象，从pics数组中删除
      this.addForm.pics.splice(i,1)
      console.log(this.addForm)
    },
    //监听图片上传成功的事件
    handleSuccess(response){
      //1 拼接得到的一个图片信息对象
      const picInfo = {pic: response.data.tmp_path}
      //2，将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    //添加商品
    add(){
      this.$refs.addFormRef.validate(async valid =>{
        if(!valid){
           return this.$message.error('请填写必要的表单项')
        }
        //致谢添加业务逻辑
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        //处理动态参数
        this.manyTableDate.forEach(item =>{
          const newInfo = {
            attr_id:item.attr_id,
            attr_value:item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item =>{
          const newInfo = {
            attr_id:item.attr_id,
            attr_value:item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form)
        //发起请求添加商品，商品名称，必须唯一
        const {data:res} = await this.$http.post('goods',form)
        if(res.meta.status !==201 ){
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
      
    }
  },
  created(){
    //获取所有商品分类数据
    this.getCateList()
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length ===3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>
